#define   _CRT_SECURE_NO_WARNINGS 1
/*
struct ListNode {
    int val;
    struct ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};*/
struct ListNode* reverseList(struct ListNode* head)
{
    struct ListNode* cur = head;
    struct ListNode* newhead = NULL;

    while (cur)
    {
        struct ListNode* next = cur->next;
        cur->next = newhead;
        newhead = cur;
        cur = next;
    }
    return newhead;
}

struct ListNode* middleNode(struct ListNode* head)
{
    struct ListNode* slow, * fast;
    slow = fast = head;
    while (fast && fast->next)
    {
        slow = slow->next;
        fast = fast->next->next;
    }
    return slow;
}
class PalindromeList {
public:
    bool chkPalindrome(ListNode* A)
    {
        struct ListNode* mid = middleNode(A);
        struct ListNode* rmid = reverseList(mid);
        while (A && rmid)
        {
            if (A->val != rmid->val)
            {
                return false;
            }
            A = A->next;
            rmid = rmid->next;
        }
        return true;
    }
};